RDR's Chrome Silicon Steel Alloy Valve Springs for 139QMB 50cc 4-stroke and 125/150cc GY6 and GY6B 4-stroke engines are rated for 12,000 RPM. The lighter your valve train components, the quicker the engine revs.
Specifications:
Compatibility: 139QMB 50cc 4-stroke and 125/150cc GY6 and GY6B 4-stroke engines
139QMB-based 50cc / 80cc engines with the following engine codes:
157QMJ-based 125cc / 150cc / 169cc engines with the following engine codes:
Don't see your engine listed? If the engine code includes "QM" or "FM" and your bike is a 4T, this product is compatible with your vehicle.
About RDR: RDR is a Taiwanese manufacturer who specializes in performance and styling parts for scooters and motorcycles.
